Oeiras to Buenos Aires: time difference
Buenos Aires is 4 h behind Oeiras. Live clocks for both, the working hours they share, and how each one sits against your own time.
−4 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Oeiras 02:41 2:41 AM Buenos Aires 22:41 10:41 PM You –:–
02:41 2:41 AM
Western European Summer Time · UTC+1
☀️ 07:51 · 🌙 18:55
22:41 10:41 PM
Argentina Standard Time · UTC-3
☀️ 06:09 · 🌙 19:11
·
−4 h
Buenos Aires is 4 h behind Oeiras.
When you, Oeiras and Buenos Aires are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇵🇹 Oeiras
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇦🇷 Buenos Aires
20 8 PM 21 9 PM 22 10 PM 23 11 PM 0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇵🇹 Oeiras | 🇦🇷 Buenos Aires |
|---|---|---|
| Local time | 02:41 | 22:41 |
| Local date | Monday, October 19, 2026 | Sunday, October 18, 2026 |
| Time zone | Western European Summer Time | Argentina Standard Time |
| UTC offset | UTC+1 | UTC-3 |
| Offset from Oeiras | — | −4 h |
| IANA zone | Europe/Lisbon | America/Argentina/Buenos Aires |
| Daylight saving | On summer time → UTC+0, Oct 25, 01:00 | Not observed |
| Sunrise | 07:51 | 06:09 |
| Sunset | 18:55 | 19:11 |
| Daylight | 11 h 4 min | 13 h 2 min |
| People on this clock | 171,767 | 2,891,082 |
Compare Oeiras with another city
More comparisons with Oeiras: the time zones next to it and the far side of the clock.
Big time differences
Oeiras and Buenos Aires: common questions
What is the time difference between Oeiras and Buenos Aires?
Buenos Aires is 4 hours behind: it uses UTC−3, while Oeiras is on UTC+1.
If it is 9:00 AM in Oeiras, what time is it in Buenos Aires?
At 9:00 AM in Oeiras, clocks in Buenos Aires show 5:00 AM.
If it is 6:00 PM in Oeiras, what time is it in Buenos Aires?
At 6:00 PM in Oeiras, clocks in Buenos Aires show 2:00 PM.
When is a good time to call Buenos Aires from Oeiras?
Between 1:00 PM and 6:00 PM in Oeiras – that is 9:00 AM to 2:00 PM in Buenos Aires – both places are within working hours (9:00 AM–6:00 PM).
Until what time in Oeiras is it still yesterday in Buenos Aires?
Before 4:00 AM in Oeiras, the date in Buenos Aires has not changed yet. From 8:00 PM in Buenos Aires, it is already the next day in Oeiras.
Is the time difference between Oeiras and Buenos Aires the same all year?
No. Only Oeiras switches to summer time, so the gap changes twice a year. From October 25, 2026, Buenos Aires will be 3 hours behind Oeiras.
